Crossword Genius

Sudden unexpected departure (4)

Ross

I believe the answer is:

flit

(Other definitions for flit that I've seen before include "Fly rapidly and lightly" , "Fly away, maybe by moonlight" , "Travel lightly and quickly" , "Secret departure (by moonlight?)" , "Move quickly and quietly (by moonlight?)" .)

I've seen this clue in The Guardian.
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